Elevator-door lock.



11 E. TOWN. v

ELEVATOR DOOR LOCK.

APPLICATION FILED MAY 31, 1906.

1 986,327, Patented Mar. 7, 1911.

4 BHEETSSHEET l.

1 WITNESSES: INVENTOR r S 'BY 2 M an. 7% 74 ATTORNEY F. 13. TOWN.ELEVATOR DOOR LOCK APPLICATION FILED MAY 31, 1906.

. Patented Mar. 7, 1911.

4 SHEETS-S gIF-T 2.

WITNESSES; ,146

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ATTORNEY F. E. TOWN.

ELEVATOR DOOR LOCK.

APPLICATION FILED-MAY a1, 1908.

Patented Mar. 7, 1911.

ATTORNEY 5.. TOWN. BEEVAIIOR DOOR LOOK.

Y I APPLICATION FILED MAY 31, 1906. 986,327. Patented Mar. 7, 1911.

WITNESSES: INVENTOR I moan/00. fm? M 637,1

ATTORNEY to provide UNITED STATES PATENT OFFICE.

FBEDERIC E. TOWN, OF NEW YORK, N. Y., ASSIGNOR TO OTIS ELEVATOR COMPANY,OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

ELEVATOR-DOOR LOCK.

Specification of Letters Patent.

Patented Mar. {7, 1911.

To all whom it may concern:

Be it known that I, FREDERIC E. TOWN, a citizen of the United States,residing in New York city,"in the county of New York and State'of NewYork, have invented a new and useful Improvement in Elevator-Door Locks,of which the following is a specification.

My invention relates to locks for doors, and although it may have ageneral application, it is particularly adapted to elevator doors ofsingle push-button automatic elevator systems.

One of the objects of my invention is the provision of magnetic meansco-acting with the door lock for effecting the closure of the doorcircuit.

Another object of the present magnetic means for controlling elevator aparatus that necessitates the locking of the oor before the car can bestarted.

A further object of this invention is to provide a combination doorlockand circuitcloser which shall be free from exposed electric terminals.

Another object of my invention is to provide a combined door lock,circuit controller and terminal-carrieriin which the circuit controllerand terminal carrier can be easily removed and replaced by another oflike structure. f

Other objects of theinvention will appear hereinafter, the novelcombinations of elements being pointed out in the claims.

Referring to the drawings, Figure 1 represents my improved door lock andcircuitcontroller in an elevational sectional view; Fig. 2 represents aportion of Fig. 1 but with the circuit-closer-in 0 en osition and thedoor unlocked; Fig. 3 IS a ii'ont view of the keeper-casing with thecircuit-closer and terminal-carrier removed; Fig. 4 is an elevationalview of the lock plate and the pants movable through the same; Fig. 5isan ele vational view of the magnetic device for controlling thecircuit-closer, and also of the frame for carrying the circuit-closerand cer tain electric terminals. Fig. 6 represents in elevation, anelevator car and well door, and in a broken away vertical sectionalview, the application of my invention to such door; and Fig. 7-is awiring diagram of a single invention is cal partition 202,

push-button automatic elevator system in connection with which myinvention may be used. y

In Fig. 1, 154 designates the elevator door to which is secured in anysuitable manner the lock casing 141, and the lock plate 195 shown inelevation in Fig. 4. Any suitable locking device may be used including abQYr eled latch 155, and ,aspindle 193,- for moving said latch againstthe action of the spring 196. The latch 155 is adapted to move throughthe opening 186 in the faceplate of the keeper-easing 140. An-ordinaryknob 189 is connected to the spindle 193 as indicated in Fig. 4 andwithin the lockcasing secured to said spindle is a pinion 198 whichmeshes with the rack of latch 155' 147 designates the locking bolt whichmust be of some magnetic material, preferably soft iron. This lockingbolt is moved outwardly through the opening 199 in the faceplate 195 ofthe lock-casing, and when the door is closed, also through the opening200 in the face-plate 185 of the keeper-casing. This outward movement islimited by the shoulder 197 in this instance. At a suitable point withinthe lock-casing 141 is a spring 192 for forcing the bolt 147 outwardly.1 A

key may be inserted through the opening 201 to turn the spindle 149 andthus move the bolt 147 to unlocking position. The connec- I tion 'of thespindle 149 with the bolt 147 when the key is inserted, may be obtainedin any well known manner, as for example. by means of a Yale lock or avprojection 147 \Vithin the keeper-casing 140 is a vertihaving an opening203 through which'projects an arm 148 which is pivoted at 204 to thelever 143. This lever is pivoted at 205 to the keeper-casing and isprovided with a spring 206 so as to move the arm 148 to its left-handposition, as shown in Fig. 1, and also to move the antifriction roller99 carried at the end of the lever arm 102 to its right-hand position. Asuitable cam carried by the car, as for mstancc, such a cam as is shownin Fig. 6, is arranged to strike the roller 99 and to move the lever arm102 to the left as shown in Fig. 2, and at the same time the arm 148 tothe right. Inasmuch as the opening 203 is opposite the upper roundedportion 162 of the locking bolt 1 17, the rod 148 will strike againstthe part 162 and move the locking bolt 117 to the right against theaction of the spring 192 and thus unlock the door. The knob 189 may thenbe turned to operate the latch 155 so that the door may be opened.

In automatic push-button elevator systems, it isalways desirable to havesome means for necessitating the closing and locking of the door beforethe elevator car can start away from the floor. This I accomplish byproviding either an electro-magnet or a permanent magnet in thekeeper-casing with poles to cotiperate with the locking bolt, which,when in looking position, effects the closure of the controlling circuitfor the electric motor which operates the elevator hoisting mechanism.

Although I have herein shown one system of automatic push-buttonelevators, such a system is set forth merely by way of il1ustration toshow the application of my invention. and obviously, therefore, myinvention is adapted for automatically controlling any circuit connectedto a door lock.

The electro-magnetie mechanism of my improved door lock comprises asolenoid 156 having an iron core with a pole 157 mounted at one endthereof, and a similar pole 158 mounted at the other end. Each of thesepoles as viewed in Fig. 1 extends to the right and each is provided withan opening 207 and 208 respectively, which in this instance iscylindrical. Through these openings passes a tube168 of insulatingmaterial, preferably glass. If desired, the opening in the pole 158 maynot extend entirely therethrough, but merely form a cylindrical recessfor the reception of the glass tube 168. This tube may be entirely openat the bottom and closed by means of a plug of cork 173, or said tubemay be closed by the material of which it is composed, as shown inFig. 1. The electro-magnet or permanent magnet may be designed to haveanv desired strength. Within this tube is adapted to move vertically, acylindrical piece of magnetic material 169, preferably soft iron. Thetube has a certain quantity of mercury 171 or other conducting fluid,placed within it and on this mercury floats the iron tube 169. In orderto give this tube 169 greater displacement when drawn down withoutincreasing its weight too much. the interior of the tube may be coatedwith some insulating material or an additional glass tube 170 placedwithin the same. The lower ends of the iron tube 169 and the glass tube170 are notched at 209 so as to prevent sticking of the tube 169 to thebottom when said tube is moved downwardly, and also to insure its quickupward movement upon leaving the cork bottom 173. These details however,may be varied by those skilled in the artas desired, without departinfrom. the principles of my invention. he upper end of the glass tube 169is closed wit insulating material 167, as by means of an ordinary cork,which is provided with a central open- [0 ing for the insertion of theinsulating rod or tube 165. This insulating rod carries the contactterminal 164, which extends downwardly a suitable distance, and isadapted to come in contact with the mercury 171, as 7:

shown in Fig. 1. Preferably the rod 165 is composed of glass which hasbeen molded over the platinum wire 164. Through the bottom of the tube168, extends another contact terminal 164 which always makes elecsotrical connection with the mercury 171.. Preferably the terminal 164' isa platinum wire as well as the terminal 164. The terminal 164 may passupwardly through the insulating bottom 173 of the tube 168, or 45 alsothrough the glass bottom 288 of the tube itself, being secured inposition when such tube is made. The parts, as thus associated.constitute a mobile circuit-closer.

Short separating blocks 159 and 161 are secured to the oles 157 and 158respectively, and an additional piece 160 is secured be tween these. Theparts 159 and 161 are made of some non-magnetic material, as forexample, brass, while the part 160 is composed of magnetic materialsimilar to the poles 157 and 158, and preferably soft iron. It willtherefore be seen that when the poles 157 and 158 with the intermediateparts 159,

160, and 161 are secured in position, an

opening 207 extends entirely through the same and in this opening isplaced the tube 168.

Normally the iron tube 169 within the glass tube 168 floats on theconducting fluid 171 as indicated in Fig. 2, when the termi nals 164 and161' are electrically disconnected. At this time the field of theelectromagnet is symmetrically distributed between the poles 137 and158. The reluctance to the lines of force between the two poles of theclectro-magnet is greatest through the parts 159 and 161 which arecomposed of non-magnetic material. Since the rmeability of these partsis substantially t e same as that by the tube 168, or in anyother'desired manner. Now .when the locking bolt 147 is allowed to bemoved to locking position as in dicated in Fig. 1, its V-shaped, roundedor semi-cylindrical face, 163, will engage with the correspondingrecesses 210', 188 and 211 of the pole 157, non-magnetic part 159, andmagnetic intermediate part 160. The locking bolt 147 being composed ofmagnetic material will provide a path of very low reluctance for thelines of force between the magnet upper pole, and the intermediate block160. The effect of this operation Will be to substantially eliminate thegap between the pole 157 and the intermediate magnetic part 160, andtherefore to shift the efiective magnetic field downwardly betweenmagnetic part 160 and the pole 158. In other words, the ends of thepoles of the electro-magnet are now the part 160 and the pole 1.58. Whenthe locking bolt 147 is in the position indicated in Fig. 2, the air-gapbetween the same and the poles of the electro-magnet is too great tohave any appreciable effect on the iron tube 169. At this time theelectro-magnet when energized tends to place the iron tube 169 midwaybetween its poles 157 and 158, but this action is counter-acted by thefloating force of the mercury. The iron tube 169 will therefore take aposition at a point slightly above the midway position between the poles157 and 158 of the elect-ro-magn'et. The magnet may be constructed so asto hold the armature 163 firmly in locking position. When the lockingbolt 147 is moved into the position shown in Fig. 1, so that the pole157 is magnetically connected to the intermediate part 160, the irontube 169 will be attracted downwardly between the pole 158 and part 160,which now is in effect the other pole of the electro-magnet. The irontube 169 will always tend to place itself in such a position as to closeany magnetic gaps, so as to lessen the reluctance to the lines of forcein the well known manner. When the iron tube 169 is thus attracteddownwardl the mercury 171 will be displaced and therefore increaseduntil it engages the inner end of the terminal 164, so as toelectrically connect the latter with the terminal 164. The terminals 164and 164 are in this instance shown in Fig. 7 as connected in thecontrolling circuit of a single pushbutton automatic electric elevatorsystem, and after the doorhas been closed, a pushbutton operated toeffect the locking of the door and the energization of the correspondingmagnet 156, the mercury will be dis placed to connect the terminals 164and 164', and the car will then respond in the usual manner.

The terminals of the electro-magnet are connected to the spring-pressedelectric contacts 180 and 212, while the terminals 164 and 164 arerespectively connected to the spring-pressed contacts 214 and 213respectively. It will be seenfrom an inspection of Fig. 5, that theelectro-magnet circuit closer and the spring-pressed contacts aresecured to each other to form a single device its depth that isremovable from the keeper-casing. When placed in position within thekeepercasing, this device is held in position by the horizontalpartition 215 and the vertical strip 145 on the one hand, and thekeepercasing face-plate 185 on the other hand. As an additionalprotection to the contacts carried by the strip 146 of theelectro-magnetic device, a plate 216 is secured to such strip 146, so asto be engaged by the face-plate 185 when the parts are in their properposition as shown in Fig. 1'.

The vertical strip 145, which is rigidly secured to the keeper-casing140, carries the binding posts 184, each of which is provided with aclamping nut 183. Each of the binding posts is split at 217 as indicatedin Fig. 3, so that when the end 1810f a wire is inserted through thelongitudinal opening in the binding post 184, t e clamping nut 183 maybe turned to securely hold the wire 181 in position, and also make goodelectrical contact with the binding post. If desired, the end 181 of thewire may be allowed to extend outwardly a short distance and then filed011' so as to be perfectly flush with the exposed end of the bindingpost. This will insure a good electrical connection between thespring-pressed contacts carried by the strip 146, and the binding ostcarried by the strip 145. The insulate wires 218 may be protected in anysuitable manner, as, for example, by metallic flexible tubing 194. V

In Fig. 7, 10 designates a main line switch which serves to connect thesource of electrical supply denoted by the and to the feed wires 1 and2. 3 designates an electrically operated switch, comprising a solenoid138 and core 144, the latter operating to lift, when suflicientlyenergized, two contact disks which are, insulated therefrom and fromeach other. The contact disk '8 upon being lifted, will place inelectrical connection the stationary contacts 4 and 5, and in likevmanner the disk 9 is adapted to connect the contacts 6 and 7 The floorcontroller 12 comprises a number of stationary contacts, 13, 15, and 16,18, etc. The floor controller is operated by some positive connectionwith the hoisting machinery. The position of the various bridging pieceson the floor controller with respect to their stationary contacts is.dependent upon the position of the elevator car in the elevator well.

The floor relays 24, 25 and 26 control res ectively the contacts 27, 28and 29, each oor relay corresponding to one of the floor push-buttons,and connected as shown, to the floor controller.

30 and 31 designate respectively the electro-magnet and contacts of anadditional relay. I

38 designates the reversing switch which is herein shown'a-s of theswinging type,

and comprises a number of stationary contacts 39, 40, 41 and 42, andalso 43, 44, 45 and 46. Mounted between these sets of contacts are themovable contacts 54, 55, 56 and 57, all of which are mounted upon andcarried by an insulated carrier 60.

61 designates the operating magnet of an accelerating orresistance-controlling device comprising the fixed contacts 62 and 63,and two movable contacts 64 and 65, the latter being adapted, whenoperated by the magnet 61, to engage the fixed contacts 62 and 63,respectively.

designates the starting resistance in series with the motor armature 71.

76 designates the magnet of a brake which may be of any preferredconstruction employing magnetic means for releasing the brake shoes.

77 and 78 are limit switches.

80 designates an elevator car connected with the hoisting apparatus inthe well known manner, and carrying open-circuit push-buttons 84, and86, each button corresponding to a floor landing.

87 designates the usual safety button, and 88 the contact carried by thecar gate, the same being closed only when the gate is closed.

Upon the top of the car is mounted the solenoid 89 having a plunger 90to which is fastened a lever pivoted at 91 and having its other endconnected by the rod 93 to the cam 94 which is movably attached to theelevator car by the links 95 and 96 pivoted to the car. 97 is a smallstop piece which limits the downward movement of the cam 94. A smallspring 92 tends at all times to keep the cam in its outward positionagainst the stop, such position being the one shown in the drawings.Upon the solenoid becoming energized, the plunger 90 will bepulleddownwardly against the action of the spring 92, thus lifting the cam 94by means of the lever and the rod 93. As the cam is lifted by thesolenoid, the links 95 and 96 will cause the cam to move inwardly towardthe side of the car.

In the path of the cam 94 which is carried by the car, are theanti-friction rollers 98, 99 and 100 of my improved door locks. Thesedoor locks are represented diagrammatically at 110, 111 and 112, andcomprise the parts hereinbefore described.

It will be seen that the electro-magnets' 156 are connected .in serieswith each other by the wire 221, and the circuit closers 220 areconnected with each other by the wire 133. p

The rollers 99 which are carried by the lever arms 102,'extend out intothe hatch way and are adapted to be engaged by the magnet-controlled cam94 carried by the car when such cam is in'its outward position. Uponsuch engagement, which may leased and again float on the mercury 17].

within the glass tube 168. The mobile circuit-closer will therefore beplaced in open position by reason of the disengagement of the mercurywith the terminal 164, and therefore the circuit 133 will beinterrupted. It should be noted that the circuit 133 is interrupted atthe reversing switch by the normal operation of stopping and thereforeno arcing will occur in t e mercury switch when the latter is opened.

The operation of the push-button elevator system illustrated in Fig. 7,is fully explained in a co-pending application of John E. Boyce, Serialif: 269,183, filed July 11, 1905, for an improvement in means foroperating an elevator door look. I do not herein claim such a system incombination with a door look, as this is broadly claimed in saidapplication of John E. Boyce. My

. invention comprises the door lock per se or in combination with suchparts comiected directly thereto that may coiiperate therewith. Theoperation of the elevator system, although fully described in the Boyceapplication referred to, will be briefly explained at this point so asto show clearly the application of my invention.

Let it be assumed that the elevator car is atthe second floor landingand a person at the first floor wishes to have the car descend to thatfloor. Upon the operation of the button 109, the circuit will be closedfrom the positive main by way of wire 122, gate contact 88, safetybutton 87, wire 123, resistance 37, coils 34 and 35, contacts 36, wire124, contacts 68 and 69, wire 120, push button 109, wire 121, coil 26,floor controller contact 125, bridge piece 127, contact 126, wire 128,solenoid 59 of the reversing switch, contacts 51 and 50, wire 129, limitswitches 77 and 78, and wire 118 to the negative main. The contacts 36will remain closed since both coils 34 and 35 are excited. The floorrelay-magnet 26 will close the contacts 29 while the reversing switchwill be operated by thesolenoid to close the contacts 54, 55, 56 and 57,against thejcontacts 43, 44,45 and 46. The operation of. the reversingswitch 38 closes the circuit from the positive main through the wire.122, gate contact 88, wires 132, 221, eleetro-magnets 156 of the doorlocks solenoid 89 of the electromagnetic cam carried by the ear, wires130, 131, contacts 46, 57, and wires 129, 118 to the negative main. Thes0lenoid.89 will thereforereceive current at the potential of the lineand will operate to lift the cam 94 out moved toloc'king position so asto effect a.

closure of the mobile circuit closer aswell as the locking of the door.The closing of this mobile circuit closer will complete a circuit fromthe positive main by wires 122, 132, 133, slack cable switch 113, wire134, solenoid 138 of magnet switch 3, wire 131, contacts 46and 57 andthe main. The solenoid 138. of the magnet switch 3 will now lift thedisks or contact makers 8 and 9, respectively, against the contacts 4,5, and 6, 7. The disk 9 completes the circuit to the motor andbrake,-and allows the motor to start. \i The bridging of the contacts 4,5, by the contact disk 8 throws a short circuit around the magnet coil35 and ush button 109.. This'has the efl'ect of exc uding control of thecar from any other station until the car has been started and sent tothe designated landing. The motor accelerates automatically and lowersthe car until the floor controller which is being driven by the hoistingap aratus, moves the bridging piece 127 away rom the contacts -126- and125.

This will occur as the car approaches its redetermined destination, atthe bottom 5001' in this instance. This action of the floor controllerwill open the circuit between the floor relay 26 and the reversingswitch solenoid 59. Both will become deenergized as well as the magnet34, and allow their respective contacts to return to theirfirstpositions. The openin of the reversing switch contacts breaks t ecircuit including the solenoid 138 of the magnet switch 3 at thecontacts 46, 57, also to the solenoid 89 of the. magnet cam through thewire 130; at thev same time current to the motor is shut oil and thebrake is applied, stopping the car at the bottom floor. Upon thedeenergization of the magnet solenoid 89, the spring 92 acting inconjunction with the weights of the various parts, causes the cam 94 tobe moved downwardly and outwardly until limited by the sto 97. Thisoutward movement of the cam orces the roller 100 which is now adjacentto the cam 94, inwardly, thereby moving the rod 148 to the right asindicated in Fig. 2, and consequently the locking bolt 147 intounlocking position. This hasfthe the magnetic. path for the lines offorce of the electro-magnet 156 that the mobile circuit-closer isopened. Since this circuitcloser is in circuit with the magnet of theswitch 3, it will now be impossible to operate the switch 3 until themercury circuitcloser has been placed in closed position again.

It should be noted that upon pressing a efiect of so changing button tostart the car, a corresponding floor relay together with the reversingswitch are energized, thereby placing the motor connections in 1properposition to raise or lower the car as t e case may be. Also theoperation oi the reversing switch supplies the magnet cam with currentallowing its operating solenoid to become energized and retract the cam,this operation automatically,

\ effecting the closure of the door lock circuit which includes themagnet of the main line switch 3, and also allowing the door to beautomatically locked. After the door lock contacts have been closed, themain line magnet is enabled to close its contacts thereby starting themotor. The ush button has also at the same time a s unt circuit thrownaround it'by the operation of the main line magnet switch 3 making it nolonger necessary to keep the push-button compressed. Contacts 66, 67 and68, 69 are provided which depend for their operation upon theaccelerating magnet, and are included in circuits supplyin the variousbuttons with current, and in t is way prevents any further operationfrom any push-button after the motor attains full speed, and until themotor has again been brought to rest, either automatically by the actionof the floor controller, or voluntarily by press: ing the safety buttonin the car.

The various landing doors can be opened only when unlocked by the actionof the magnet cam carried by the car, or by means of a key and themagnet cam cannot be placed in unlocking position until the car. hasbeen brought to rest to the. proper floor. Then, and only then, is itpomible ordinarily to open the landing door. While such door is open,the car cannot be moved since the contacts of the door lock .are ofnecessity, owing to their construction, disconnected through the mercurywhile such door is open, and since these contacts include a circuit tothe main line magnet, it will be evident that current cannot be suppliedto the motor until the landing doors are all closed and locked, therebybringing their respective contacts into electrical connection witheachother and making it possible to start the hoisting moton, It will benoticed that the door must be closed before the circuit in-' cludingwire 133 can be closed, as the cir" cuit-closer 220 is in thekeeper-casing 140 which is in the door jamb. Furthermore, it is evidentthat the parts-are shown so adjusted that the door will necessarily belocked before the circuit-closer220 can electrically connect theterminals 164 and 164". When the solenoid 8.9 is energized, the arm 102,which isrigidly connected to the looking rod 148, is released so thatthe spring 192 will force the locking-bolt 147 to locking position. Whenthe parts are in the position shown in Fig. 2, the door maybe opened byturning the knob 189 connected to the spindle 193, and thus withdrawingthe latch 155.

Although I have herein shown an electro magnet solenoid 89, foroperating the plunger 90, which construction is in reality an electricmotor having a reciprocating armature, it is obvious that it is withinthe province of my invention to substitute for this form of motor anyother form, as, for example, the ordinary direct current motor with arotating armature. I desire it to be further understood that with slightmodification, my invention may be used for other purposes thancontrolling the locking of elevator doors, as, for example, theautomatic operation of means for locking doors adjacent to the path oftravel of railway cars.

Having'thus fully described my invention and without limiting myself tothe details of construction and arrangement of parts herein disclosed,what I claim and desire to have protected by Letters Patent of theUnited States is 1. The combination with a car, of a door adjacent thepath of travel of said car, a locking device for said door, apparatusfor operating said car, and an electro-magnetic circuit-closermagnetically controlled by the locking device for rendering saidoperating apparatus inoperative except when the door is closed andlocked.

2. The combination with a car having a doorway, of means for moving thesaid car, controlling apparatus for said moving means, a door adjacentthe path of travel of said car, locking mechanism for said door, and aliquid circuit-closer co-acting with and controlled by said lockingmechanism and controlling apparatus to prevent said car from beingstarted away from said door except when the door is closed and locked.

3. The combination with a car, of a plurality of doors, lockingmechanism for each door, means carried by the car for mechanicallyoperating said mechanism, said oper-s ating means being operable toactuate said locking mechanism to unlocking position only when the caris opposite said locking mechanism, and an electro-magneticcircuitcloser co-acting directly with and including said lockingmechanism in the magnetic.

circuit for preventing said car from being started until after the dooris closed and locked.

4. The combination with an elevator car. of means for o erating thesame, a hatchway door, a locking device therefor, a fluid circuit-closerco-acting with and controlled by said door-locking device, a controllingcircuit including said circuit-closer, and means permitting theunlocking of said door and the opening of said circuit-closer ismco-acting with said cam for operatin the same to effect the release ofsaid loc. only when the car is at rest opposite said door, and anelectro-magnetic circuit-closer having its magnetic circuit controlledby the position of the door and co-acting with said lock and said caroperating-means for preventing the car from being started until afterthe door is closed and locked.

6. The combination with a push-button controlled elevator systemincluding a car, of hatchway doors, a lock for each of said doors, meansfor unlocking said doors, means controlled from any landing or from thecar for operating said unlocking means, apparatus for preventing theunlocking of the doors except when the car has stopped opposite "a door,and electro-magnetic mobile circiiit-closers oo-acting with said locksand said operating means for preventing the starting of the car untilthe door is closed and locked.

7. The combination with an elevator and means for controlling the same,of a well door, locking mechanism for said door, a mobilecircuit-closer, and ma tic means including a part carried by t edoor'and' circuit-closer, and means effecting the opera: tion of saidcircuit-closer when the electromagnet is energized and the locking boltis in closed and locking position.

9. Thecombination with an elevator, of a well door, locking meanstherefor coin rising a locking bolt of magnetic materia anelectro-magnet having one of its les extended to said locking bolt whenthe door is in closed position, a mobile circuit-closer between thepoles of the said electro-ma'gnet, sections of non-magnetic materialadjacent the poles of said electro-magnet a section of magnetic materialbetween said sections of non-magnetic material, and means for energizingsaid electro-ma et to effect the operation of said circuit-c oser whenthe door is in closed position. i

10. The combination with an elevator, of a well door, locking mechanismfor said door and comprising a lock casing and a keeper casing, alocking bolt having an exposed portion, composed of ma etic material, anelectro-magnetic device in the keeper casing, a mercury circuit-closerbetween the poles of mg arranged in the the locking bolt, to bemagneti-' cally connected by said magnetic device, and a section of manetic material mounted between said'po es but out of magnetic contacttherewith, one of said poles and said magnetic sectionbepath of themagnetic portion of V the latter and thereby effect the operation of themercury circuitcloser when the electro-magnetic device is supplied withcurrent.

11. The combination with an elevator, of a well door, a lock casingcarried by the door, a keeper casing opposite said lock casing when thedoor is in closed position, an electro magnet carried by said keepercasing, a piece of magnetic material between the poles of saidelectro-magnet but magnetically separated therefrom when the door is inopen position, a locking bolt carried by the lock casing andmagnetically connecting one of the poles of said electro-magnet and saidiece of magnetic material when the door is in closed position, areceptacle between the poles of said electro-magnet for electricconducting liquid, a plurality of contacts, and a magnetic device fordisplacing said liquid to electrically connect said contacts when thedoor is in closed position and the locking bolt magneticall'yconnectsone of the poles of said electro-magnet and the intermediate piece ofmagnetic material.

12. The combination with an elevator, of a well door, locking mechanismfor said door comprising a locking bolt 'having an exposed portioncomposed of magnetic material, an electro-magnet, a plurality of sections of non-magnetic material with an in-' termediate section. ofmagnetic material be tween the poles of said electro-magnet, areceptacle for containing liquid conducting material, a plurality ofelectric contacts, and a magnetic device in said receptacle for displacing said liquid to effect the connection of said contacts when thedoor is closed, and

said locking bolt magnetically connects one of the poles of theelectro-magnet andsaid intermediate section of magnetic material.

13. The combination with an elevator, of a well door, locking mechanismcomprising a. locking bolt havlng its exposed portion minal extendinginto said composed of magnetic material, asection of magnetic materialbetween the poles of said electro-magnet, a tube of insulating materialpassing through said poles, an electric tertube at each end thereof, atube of magnetic material fitting within said tube of insulatingmaterial, a lining for said tube of magnetic material,

. and liquid conducting material in said tube of insulating materialtoeffect the electric connection of said terminals when one of the polesof the electro-magnet and said section of magnetic material ismagnetically con nected by the locking bolt'when the door is in closedand locked position.

14. The combination with an elevator, of

a well door, locking apparatus for said door,

controlling means for the elevator, and an electro-magneticcircuit-closer removably carried by said locking apparatus.

15. The combination with an elevator, of a well door, locking apparatuscomprising a lock casing, and a keeper casing, and an electro-magneticcircuit-closer removably connected with said keeper casing.

16. The combination with an elevator, of a well door, locking apparatus,an electromagnet, a mobile circuit-closer, terminals for saidelectro-magnet and said circuit-closer, binding posts opposite saidterminals, and a frame for rigidly connecting and carrying saidelectro-magnet, circuit-closer and terniinals, said frame beingremovably secured to a portion of the locking mechanism.

17. The combination with a car, of controlling apparatus therefor, adoor adjacent the path of movement of the car, door-locking mechanism, amercury circuit-closer cooperating with said mechanism to place itselfin closed position only when the door is closed and locked, andmeanseffecting the interruption of current through said circuitcloserbefore the latter is opened.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

FREDERIC E. TOWVN.

\Vitnesses:

V: H. S'ronns, CHARLES M. NISSEN.

